Things to remember

Question 1

Electron flow direction

Answer 1

electrons flow from negative to positive

Question 2

kirchoff’s first law

Answer 2

Kirchoff’s first law states that for any point in an electrical circuit, the sum of currents into that equals the sum of currents out of that point

Question 3

Name the 6 important forces

Answer 3

weight, friction, drag, tension, upthrust, normal contact force

Question 4

What is drag?

Answer 4

the resistive force of an object travelling through a fluid

Question 5

What is the principle of moments?

Answer 5

When a body is in equilibrium, the net force acting on the body is zero as well as the net moment

Question 6

What is a couple?

Answer 6

A couple is a pair of forces applied to an object that cause it to spin about it’s centre of mass

Question 7

How do you calculate the torque of a couple?

Answer 7

Torque = F*d (Magnitude of forces * distance BETWEEN APPLIED FORCES)

Question 8

What is torque measured in?

Answer 8

Nm

Question 9

What is archemedes principle?

Answer 9

The thrust exerted on a body in a fluid is equal to the weight of the fluid the body displaces

Question 10

Name the 7 energy stores?

Answer 10

chemical, gravity, kinetic, thermal, elastic, nuclear, electromagnetic

Question 11

Which are the three equations needed to derive the equation for kinetic energy?

Answer 11

W = Fx
F = Ma
v2 = u2 + 2as

Question 12

What are the two equations for power?

Answer 12

P = W/t
P = F*v